A private key is different in Stobox 4.
You will not see any words or phrases here because the wallet type is different, and it divides the private keys into a couple of parts, so no one has access to your wallet since no one has the entire private key except you.
During the registration process, you are encouraged to download a copy of your private keys as a backup file. The file's default name is StoboxBackupKeys, and the extension is JSON.
Be sure to find it and save it in a safe location. You can also make a few copies.
If you lose your backup file, we can't help you recover access to your account or funds.
Extracting the private key from Stobox 4 is possible, but in this case, you will permanently delete your Stobox 4 account, and no one will be able to restore it.
Read more about the MPC wallets and their backups in Wallet Management.